meridian vs sexual activity

meridian and sexual activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
meridian	Yes	Yes	No	No
sexual activity	Yes	No	No	No

meridian (noun)	sexual activity (noun)
an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator	activities associated with sexual intercourse
the highest level or degree attainable; the highest stage of development

meridian (adjective)	sexual activity (adjective)
of or happening at noon
being at the best stage of development